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GNU IceCat vs LibreWolf: catalog facts
GNU IceCat	LibreWolf
Free Free software from the GNU Project with no paid tier.	Free Free and open source under the MPL 2.0, maintained by volunteers.
Linux	Windows, macOS, Linux
Contains only free software, with no nonfree add-on recommendations LibreJS blocks nonfree JavaScript	Deletes cookies and website data on close by default Ships uBlock Origin with custom default filter lists and strict tracking protection
Blocking JavaScript breaks many modern sites until you allow scripts Builds are distributed from a third-party download page	The aggressive defaults break some sites and log you out every time you close the browser Resist Fingerprinting changes timezone and window size reporting, which confuses a few web apps
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MPL-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 20, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.